Magnetically-operated tool



7 Dec. 3, 1957 W. E. COOK MAGNETICALLY-OPERATED TOOL INVENTOR! MAL/120 5. 600K Filed Sept. 6, 1955 llnited States Patent MAGNETICALLY-OPERATED TOOL Willard E. Cook, Delta, Utah Application September 6, 1955, Serial No. 532,688

2 Claims. (Cl. 310-32) The present invention relates to a magnetically-operated tool.

An object of the present invention is to provide a portable magnetically-operated tool for drilling, hammering, sawing, chiseling, and other operations, and one which has few working parts of simple structure.

Another object of the present invention is to provide a portable magnetically-operated tool for drilling rock and one having means for supplying water to the rock drill bit.

A further object of the present invention is to provide a portable magnetically-operated tool in which the speed of reciprocation of the tool bit is variable.

A still further object of the present invention is to provide a magnetically-operated tool of light weight and sturdy construction, and one commercially practical.

These and other objects and advantages of the present invention will be fully apparent from the following description when taken in connection with the annexed drawings, in which:

Figure 1 is an elevational view of the tool of the present invention showing it connected to a device for supplying current to first one coil of the tool and then to the other coil, the device being shown schematically,

Figure 2 is a sectional view, on an enlarged scale, taken on the line 2-2 of Figure 1, and

Figure 3 is a sectional view taken on the line 33 of Figure 2.

Referring in greater detail to the drawing in which like numerals indicate like parts throughout the several views, the magnetically-operated tool of the present invention consists in a casing having its ends 11 and 12 closed. A rod 13 extends axially through the casing 10 and is slidably supported in the closed ends 11 and 12 of the casing and has one end 14 exteriorly of the closed end 11 of the casing and has its other end 15 exteriorly of the end 12 of the casing.

A partition 16 fabricated of a nonmagnetic material is fixedly secured transversely of and within the casing 10 inwardly of and spaced from the closed end 11 and another partition 17 is fixedly disposed transversely of and within the casing 10 and inwardly of and spaced from the closed end 12. The partitions 16 and 17 have apertures therethrough and loosely surround the rod 13. A sleeve 18 within the casing 10 separates the partitions 16 and 17, the partitions 16 and 17 with the sleeve 18 defining a chamber.

A solenoid coil 19 is positioned within the casing 10 in the space between the partition 16 and the closed end 11 of the casing 10 and another solenoid coil 21 is positioned Within the casing 10 in the space between the partition 17 and the closed end 12 of the casing, the solenoid coils 19 and 21 being hollow and surrounding the adjacent portions of the rod 13. A magnetic member 22, consisting of a pair of annular disks, is positioned within the chamber and is fixedly carried by the rod 13.

Means is provided on the one endof the rod 13 which projects through the closed end 11 of the casing 10 for 2,815,457 Patented Dec. 3, 1957 attachment of a work implement. Specifically, such means embodies a sleeve or chuck 23 having a locking bolt 24 for receiving one end of a work implement tool such as the star drill 25 shown in Figure 1.

The rod 13 is hollow and its other end which extends through the closed end 12 of the casing 10 is provided with a coupling 26 for securing that end of the rod 13 to a flexible conduit 27 for connecting the interior of the rod 13 to a source of water under pressure.

Preferably, the casing 10 is constructed of a magnetic material and a sleeve 18 is constructed of a nonmagnetic material so that when the coils 19 and 21 are energized the flux path of each coil will traverse the chamber. When the coil 19 is energized the magnetic member 22 is attracted towards the partition 16 and when the coil 21 is energized the magnetic member 22 is attracted toward the partition 17.

each of the coils 19 and 20 in succession. Specifically, such means embodies a rotary contact-making device indicated generally by the reference numeral 28 in which is a movable contact 29 and a pair of fixed contacts 31 and 32. The rotary contact-making device 28 is shown somewhat schematically in Figure 1 and shows the movable contact 29 mounted upon one end of a shaft 33 which is supported intermediate its ends in an upstanding bracket 34 mounted upon the upper end of a motor 35. The other end of the shaft 33 carries a conically-shaped pulley 36. The motor shaft 37 also carries a conically-shaped pulley 38 and a belt 39 connects the pulleys 36 and 38 0 together for driving the movable contact 29 into engagement first with the fixed contact 31 and then into engagement with the fixed contact 32 successively.

A speed-shifting device is indicated generally by the reference numeral 41 and consists in a belt-engaging guide 42 carried upon one end of a core 43 of a flexible shaft assembly 44, the other end of the core being secured to a manually-operable button 45 for shifting the core 43 within the outer covering of the assembly 44, the guide 42 being movable upon the device 41 to effect the shifting of the belt 39 upon the pulleys 36 and 38 to change the speed of rotation of the movable contact 29.

An electric cable 46 connects the contacts of the rotary contact-making device 28 to the coils 19 and 21 within the casing 10, it being understood that one contact 31 will energize the coil 19 and the other contact 32 will energize the coil 21, there being a common ground for the coils 19 and 21. An electric cable 47 connects the rotary contact-making device 28 to a source of current.

A cushioning device 48 consisting of a disk of resilient material such as rubber or Neoprene or the like is positioned within the chamber adjacent the inner face of the partition 16 and a similar cushioning device 49 is similarly positioned with respect to the partition 17.

In use, with a suitable tool bit in the chuck 23, the magnetically-operated tool of the present invention is connected to a source of current and the coils 19 and 21 are energized in turn and cause the magnetic member 22 to impart reciprocating movement to the rod 13 to deliver striking blows to the work engaged by the tool bit. When it is desired to change the rate of reciprocatory movement of the tool, the button 45 is pulled or pushed to move the guide 42 and thereby shift the belt 39 upon the pulleys 36 and 38. The coils will then be energized at a faster or slower rate, depending upon which way the belt was shifted.

What is claimed is:

l. A magnetically-operated tool comprising a casing fabricated of magnetic material having each of its ends closed, a hollow rod extending axially through said casing and slidably supported in the closed ends of said casing and having one end exteriorly of one of the closed ends of said casing and having the other end exteriorly of the other of the closed ends of said casing, a partition fabricated of nonmagnetic material fixedly disposed transversely of'andwithin said'casing inwardly of andspaced from each of the closed ends of said casing and loosely surrounding said rod, a sleeve fabricated of non-magnetic material separating said partitions, said partitions and said sleeve defining a chamber, a solenoid coil positioned in said casing within the space between each partition and the adjacent casing closed end and surrounding the adjacent portion of said rod, a magnetic member embodying a pair of disks positioned within said chamber and fixedly carried by said rod, means on one of said projecting ends of said rod for attachment of an implement thereto. conduit means connected to the other end of. said rod for connecting the interior of said rod to a source of water under pressure, one of said coils upon being energized causing attraction of one of the pair of disks of said magnetic member toward one of the partitions and consequent sliding movement of. said rod in one direction and the other of said coils upon being energized causing attraction of the other of the pair of disks of said magnetic member toward the other of said partitions and consequent sliding movement of said rod in the opposite direction,

2. A magnetically-operated tool comprising a casing fabricated of magnetic material having each of its ends closed, a rod extending axially through said casing and slidably supported in the closed ends of said casing and having one end exteriorly of one of the closed casing ends and having the other end exteriorly of the other of the closed ends of said casing, 'a partition fabricated of non-magnetic material fixedly disposed transversely of and within said casing inwardly of and spaced from each of the closed ends of said casing and loosely surrounding said rod, 'a sleeve fabricated of non-magnetic material separating said partitions, said partitions and said sleeve defining a chamber, cushioning means within said chamber adjacent each of said partitions, a solenoid coil positioned within said casing in the space between each partition and the adjacent casing closed end and surrounding the adjacent portion of said rod, a magnetic member embodying a pair of disks positioned within said chamber and fixedly carried by said rod, means on one of the projecting ends of said rod for attachment of an implement thereto, conduit means connected to the other end of said rod for connecting the interior of said rod to a source of Water under pressure, one of said coils upon being energized causing attraction of one of the pair of disks of said magnetic member toward one of said partitions and consequent sliding movement of said rod in one direction and the other of said coils upon being energized causing attraction of the other of the pair of disks of said magnetic member toward the other of said partitions and consequent sliding movement of said rod in the opposite direction.

ReferencesCited in the file of this patent UNITED STATES, PATENTS 256,850 Odell Apr. 25, 1882 1,357,613 Cianfrone Nov. 2, 1920 1,431,808 Jackson Oct. 10, 1922 1,851,850 Lamar Mar. 20, 1932 1,891,062 Sager Dec. 13, 1932 1,954,575 Pearson Apr. 10, 1934 FOREIGN I PATENTS 17,716 Great Britain -a of 1911 

